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Pectenocypris Nigra, a New Danionine Species (Teleostei: Cyprinidae: Danioninae) from Sumatra (Indonesia)

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Pectenocypris Nigra, a New Danionine Species (Teleostei: Cyprinidae: Danioninae) from Sumatra (Indonesia) 4 Pectenocypris nigra, a new danionine species (Teleostei: Cyprinidae: Danioninae) from Sumatra (Indonesia) Arif WIBOWO1, Harald AHNELT*2, Endi S. KERTAMIHARDJA3 1Research Institute for Inland Fisheries, Agency for Marine and Fisheries Research, Ministry of Marine Affairs and Fisheries, Jl. Beringin 08 Mariana, Palembang - 30763, Indonesia. 2Department of Theoretical Biology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria. 3Research Center for Fisheries Management and Conservation, Agency for Marine and Fisheries Research, Ministry of Marine Affairs and Fisheries, Gedung Balitbang KP. II, Jl. Pasir Putih II, Ancol Timur 14430, Jakarta, Indonesia. *Corresponding author: [email protected] Abstract: A new species of Danioninae, Pectenocypris nigra nov. sp. is described from peat swamps in the Riau Province, central Sumatra (Indonesia). The species differs from its congeners in the combination of the following characters: a distinct mid-lateral stripe, black spot on the base of the caudal fin, scales pale fawn with blackish margin; 28-30 scales in lateral midline, 7-10 pored lateral line scales, 160 gill-rakers on the first gill arch, and a short and deep caudal peduncle. Keywords: Pectenocypris, Taxonomy, Morphology, Endemic, Indonesia. Zoobank: urn:lsid:zoobank.org:pub:7D5A7FBD-8FE6-4D93-BCF6-DE720C0D5B1D urn:lsid:zoobank.org:act:0698149F-E447-49E6-8C33-B8C2463A9B00 Introduction postorbital length (posterior most edge of the eye to the The small cyprinid genus Pectenocypris is currently posteriormost point of the opercle), prepectoral length (tip known to comprise three species: Pectenocypris balaena of snout to dorsal origin of the pectoral fin) and pectoral- Roberts, 1989 from western Borneo (Kalimantan Barat pelvic length (dorsal origin of pectoral fin to lateral origin Province), P. korthausae Kottelat, 1987 from southern of pelvic fin). Measurements were taken to 0.01 mm using Borneo (Kalimantan Tengah Province), and an electronic caliper and rounded to the nearest 0.1 mm. P. micromysticetus Tan & Kottelat, 2009 from Sumatra Counts and measurements were taken twice; the data are (Jambi Province) (Roberts, 1989; Doi, 1997; Tan and presented as means. The pharyngeal jaw was investigated Kottelat, 2009). All species are small (<45 mm SL) with by MicroCT imaging (for details of MicroCT imaging see a slender body and with numerous and extremely Ahnelt et al., 2015). Type specimens are deposited in the elongated gill-rakers (Kottelat, 1982; Roberts, 1989; Tan Museum Zoologicum Bogoriense (MZB), Bogor, and Kottelat 2009). Indonesia, and the Naturhistorisches Museum Wien In this paper we describe an additional species of (NMW), Vienna, Austria. Additional institutional Pectenocypris from the Serkap River drainage in central abbreviations: MHNG = Muséum d’histoire naturelle, Sumatra (Riau Province). Ville de Gèneve. Comparative material Materials and Methods Pectenocypris korthausae Kottelat, 1982; MHNG Specimens were sampled in peat lakes of the Serkap River 2073.073-075, three paratypes; 20.31-21.1 mm SL; system, Sumatra (Fig. 1). Counts and measurements Indonesia, Borneo, Kalimantan Tengah, approximately 50 follow Kottelat (2001). We also measured predorsal, to 100 km North of Sampit; collected by Mrs. Korthaus, prepelvic, preanal length and dorso-hypural distance (Tan March 1979. CAS 50488, one paratype; 20.7 mm SL; and Kottelat, 2009) and added head width (distance from same data as MHNG 2073.073-075. CAS 94171, three left to right dorsal origin of the opercular opening), specimens; 31.8-36.6 mm SL; Indonesia, Borneo, 137 ACTA BIOLOGICA TURCICA 29(4): 137-134, 2016 Figure 1. Sampling site of Pectenocypris nigra, Teluk Kapal, Sumatra. Insert: Location of Riau province (dark grey) in Sumatra. Kalimantan Tengah, Sungai Seruyan Basin, Danau gill-rakers on first gill-arch; Kalimantnan Tengah, Sembuluh at Bangkal (-2.701715°, 112.388515°; source: Born……………………....….. Pectenocypris korthausae FishNet Collaborative Georeferencing Project); collected 3- Black spot at base of caudal fin oval; pale fawn scales by Tyson R. Roberts, 12-13 June 1992. with blackish margin; symphysal knob distinct; 160 gill- Pectenocypris balaena Roberts, 1989; CAS 49307, five rakers; Riau, Sumatra………Pectenocypris nigra sp. nov. paratypes; 23.3-28.5 mm SL; Indonesia, Borneo, - Black spot at base of caudal fin absent; dark grey scales Kalimantan Barat, Kapuas River Basin, Danau Piam near with pale fawn margin; no symphysal knob; 180-212 gill- Ketungau, 39 km NNE of Sintang (0°23'30''N, rakers; Kalimantan Barat, Borneo……………………….. 111°37'30''E); collected by Tyson R. Roberts and ……………………………………Pectenocypris balaena S. Woerjoatmodjo, 5-6 July 1976. Pectenocypris nigra, new species Results (Figs. 2-4, Table 1) Generic diagnosis: The genus Pectenocypris Kottelat, Holotype: MZB 22149; 33.1 mm SL, Indonesia, Central 1982 differs in following morphological characters from Sumatra, Riau province, peat swamp, Serkap river system, all other known genera of Cyprinidae: very long, densely river and peat lakes ‘Teluk Kapal’ (00°25'42''N, set and numerous gill rakers; shape of lower pharyngeal 102°38'45''E) aproximately 90 km east of Pelalawan; jaws tripodal; the posterior limb of each pharyngeal jaw collected by A. Wibowo and party, May 2013. with two processes (forked). Type species: Pectenocypris Paratypes: MZB 22150; 5, NMW 98607; 2, 30.2-34.2 mm korthausae Kottelat, 1982. SL; same data as holotype. Key to species of Pectenocypris: Etymology: From the Latin word niger meaning “black”. 1- Black mid-lateral stripe absent; lower jaw not or only The name refers to the blackish coloration of the species indistinctly projecting beyond upper jaw…… ……...…. 2 in life. - Black mid-lateral stripe distinct; lower jaw distinctly Diagnosis: Pectenocypris nigra sp. nov. differs from all projecting beyond upper jaw.……..………………….... 3 congeners (P. balaena, P. korthausae and 2- Black spot at base of caudal fin elongated; 165-240 gill- P. micromysticetus) by the following unique combination rakers on first gill-arch; Jambi, Sumatra………………… of characters: a distinct mid-lateral stripe; an oval black …………….……………Pectenocypris micromysticetus spot on the base of the caudal fin; scales pale fawn with - Black spot at base of caudal fin oval to roundish; 95-135 blackish margin; 28-30 scales in lateral midline; lateral 138 Wibowo et al.- Pectenocypris nigra, a new danionine species of Cobitis avicennae Figure 2. Pectenocypris nigra, holotype, 33.1 mm SL, lateral view. MZB 22149. Scale bar = 5 mm. (right side, reversed). Mid-lateral stripe does not extend on opercle (opercle covered by many similar sized small melanophores). Table 1. Characters of Pectenocypris. Pb- Pectenocypris balaena, Pk- Pectenocypris korthausae, Pm- Pectenocypris micromysticetus, Pn- Pectenocypris nigra. Characters of coloration are separated from other morphological characters by a double line. ? - character not known. Characters Pb Pm Pk Pn Scales in lateral series <30 + + - + Scales in lateral series >31 - - + - Pored lateral line scales 7-8 + + - - Pored lateral line scales 7-10 - - + + Number of gill rakers <140 - - + - Number of gill rakers <170 - - - + Number of gill rakers <220 + - - - Number of gill rakers <250 - + - - Denticles on first pharyngeal tooth ? ? + - Lower jaw distinctly projecting upper jaw + - - + Caudal peduncle long, narrow + + - - Caudal peduncle short, deep - - + + Black mid-lateral stripe distinct + - - + Black mid-lateral stripe absent or indistinct - + + - Light narrow stripe dorsal to mid-lateral stripe present - - - + Light narrow stripe dorsal to mid-lateral stripe absent + - + - Thin black mid-dorsal stripes present + + ? - Thin black mid-dorsal stripes absent - - ? + Black spot on base of caudal fin present - + + + Black spot on base of caudal fin narrow, elongate - + - - Black spot on base of caudal peduncle wide, round - - + - Black spot on base of caudal fin oval - - - + Scales light with dark margins - - + + Scales dark with light margin + + - - line incomplete, with 7-10 pored scales; 160 gill-rakers forked with pointed and elongated lobes; caudal peduncle (n=1) on the first gill arch; and a short and high caudal short, high, nearly 60% as high as long. peduncle. Measurements of holotype (33.1 mm SL) and paratypes Description: See Figure 2 for overall appearance. Body (30.1-34.2 mm SL) as percent of standard length (range slender, compressed; body depth deeper than head depth; and mean in parentheses, values of holotype in brackets): dorsal outline slightly arched, ventral outline straight; head length 26.5-28.8 (28.0) [28.2], head width at dorsal mouth terminal; jaws short; lower jaw with distinct origin of gill opening 12.4-13.4 (12.8) [13.4], head depth symphysal knob; gill rakers densely set, thin and very at nape 15.4-16.2 (16 [16.1], predorsal length 50.8-54.9 long; dorsal fin originates above or slightly before pelvic (52.7) [54.6], prepelvic length 51.8-54.1 (52.9) [53.6], fin; pectoral fin long, roundish, reaching about 75% of preanal length 72.2-75.7 (74.1) [74], prepectoral length distance to pelvic fin; depressed tip of the first (longest) 28.0-29.7 (28.7) [29.2], pectoral-pelvic length 24.0-25.2 pelvic fin ray reaches origin of anus; caudal fin distinctly (24.3) [24.9], pectoral fin length 16.6-17.9 [17.8], body 139 ACTA BIOLOGICA TURCICA 29(4): 137-134, 2016 first gill arch. Gill-rakers and gill filaments of about the same length. Vertebral count (n=2): 32; 17 precaudal+15 caudal vertebra. The pharyngeal jaws (n=2) are of a tripodal shape (Fig. 4). The posterior limb of each pharyngeal jaw is forked ending in two distinct processes. Three teeth are attached perpendicularly on the medial side of the tooth-bearing process and are arranged in a single row (tooth formula 3- 3). The shape of the pharyngeal jaws and the pharyngeal teeth of P. nigra are similar to those of P. korthausae (Kottelat, 1982; Fig. 1) and to P. balaena (Roberts, 1989). But contrary to P. korthausae, no pharyngeal tooth of Figure 3. Pectenocypris nigra, holotype, head, lateral view. MZB P. nigra has denticles. The shape of the pharyngeal jaws 22149. Scale bar = 0.5 mm. Note whitish symphysial knob on and the pharyngeal dentition of P.
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